http://bugs.winehq.org/show_bug.cgi?id=7387
--- Comment #16 from Bruno Jesus 00cpxxx@gmail.com 2011-09-18 11:46:05 CDT --- I guess it's a wine mapping issue because I've never been able to run anything in wine+dosbox outside drive C. When the path is outside drive C wine should wine mount drive C as usual and then mount a drive D with the outside path?
It's important to remember that dosbox has an internal drive Z, so wine should not try to mount the outside path over it.